Oil-burner.



PATENTBD 00T. 10, 1905.

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EMIL OHRISTENSEN, OE PORTLAND, OREGON.

OIL-BURNER.

Specification of Letters Patent.

Patented Oct. 10, 1905.

Application filed October 26, 1904. Serial No. 230,084-

To rif/ZZ whom it may concern:

Be it known that I, EMIL OHRIsTENsEN, a citizen of the United States, residing at Portland, in the county of Multnomah and State of Oregon, have invented a new and useful Oil-Burner, of which the following is a specilcation.

This invention relates to oil-burners, especially to burners of that class in which mingled steam and oil are utilized for heating steam-boilers and the like.

One of the principal objects of the invention is to provide an oil-burner in which the quantity of steam and oil passing through the burner may be readily controlled in accordance with the temperature or boiler-pressure desired without lessening the pressure or velocity of travel of the iuids.

A further object of the invention is to provide a novel form of burner in which the heated steam is utilized to raise the tempera'- ture of the oil and partly vaporize the same before the fluids issue from the burner.

A still further object of the invention is to provide an oil-burner in which ready adjustment may be accomplished iu accordance with the pressure or temperature desired, so that when once adjusted the pressure of a steamboiler may be automatically maintained.

A still further object of the invention is to provide a burner of the automatic type in which apilot-light will be constantly maintained, so that when the main feed is cut out by excess pressure the ame will not be entirely extinguished and relighting rendered unnecessary.

A still further object of the invention is to provide a novel form of burner in whichprovision is made for readily blowing out any tarry or carbonaceous deposits which may form in the oil-passage.

l/Vith these and other objects in view, as will more fully hereinafter appear, the invention consists in certain novel features of construction and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size, and minor details of the structure may be made without departing from the spirit or sacrificing any of the advantages of the invention. Y

In the accompanying drawings, Figure 1 is a longitudinal sectional elevation of an oilburner constructed in accordance with the invention. Fig. 2 is a transverse rsectional view of the same on the line 2 2 of Fig. 1, the view being on an exaggerated scale. Fig. 8 is a plan view of the inner end of the burner, also on an enlarged scale.

Similar numerals of'reference are employed to indicate corresponding parts throughout the sev'eral figures of the drawings.

The outer casing of the burner is in the form of a tube 10, at one end of which is a T 11, to which is connected an oil-supply pipe 12. .In the outer end of the T is screwed a ring-nut 18, through which extends a steamsupply tube 14, a nut 15 being screwed into such ring nut and forming, in connection therewith, a packing-box to prevent the accidental escape of the oil. To the outer end of the steam-tube 14 is coupled a T 17, to which is connected a steam-supply pipe 18, there being a flanged by-pass 19 -between the oil and steam pipes in order that steam may be admitted to the oil-tube when the latter becomes choked from accumulations of deposits. In the outer endof the T 17 is a nut 22, having internal threads for the threaded portion of a regulating-stem 23, that extends down through a suitable stuiiing-box 24 and is provided with an operating-handle 25.

The steam-tube and the oil-tube are connected by a cylindrical block 27, having a pair of concentric threaded fianges for the reception of the threaded ends ofthe tubes, and

the inner of these anges forms a cylinder 29, in which is arranged a hollow piston 30, the periphery of said piston being provided with suitable packing-rings.

The piston 30 has a forwardly-extending portion that is tapered to form a valve 32, and said forwardly-extending portion is guided through an opening 33, formed in said block 27, the valve and piston being free to slide in the direction of the length of the oil-burner. The piston is thrust forwardly by the pressure of the steam entering its rear end; but its movement is resisted to some extent by a coiled compression-spring 36, arranged within the forward end of said cylinder, excessive rearward movement of the piston being prevented by the forward end of the steam-tube, the latter being of less diameter than said piston and forming a stop therefor. Within the steam-tube is a helical compression-spring 37, which exerts its force in a direction opposite to the spring 36, and said springs are of unequal strength, spring 36 being the strongest and exerting, say, one hundred pounds pres- IOO IIO

sure, while the spring 37 may be made to exert any desired pressure in order to assist the pressure of the steam in overcoming the stress of the spring 36. The rear end of the spring 37 bears ag'ainst a washer-ring 39, having a recessed periphery to permit the free passage of steam, and this pressure is carried by the adjusting' and regulating stem 23, so that by turning' said stem the stress of the spring 37 may be adjusted in accordance with the desired pressure.

In the outer end of the block 27 is asteamchamber 40, that is placed in communication with the interior of the valve 32 by a plurality of ports 41, and the forward wall of this steam-chamber is tapered, being nozzle-like in contour, and the opening for the passage of the valve 32 being of a contour corresponding to that of the valve, an annular passage being formed between the two when the valve is open.

On the block 27 is screwed a nozzle-head 43, that is also provided with a tapered dischargeopening 44, and this opening 'forms a seat for the outer portion of the valve 32. Between the block 27 and the head 43 is an annular chamber having' inclined walls, and said chamber is placed in communication with the oiltube by means of a plurality of openings 46, extending` through the block 27.

Secured to the outer end of the nozzle 43 is a deflector-plate 48, the uppermost surface of which is in a planea trifle below the axial plane of the burner, and the rear portion of the deflecting-surface is slightly inclined on a line corresponding' to the tapering wall of the discharge-opening' 44. Y

In the operation of the burner steam and oil under pressure are admitted to the two tubes, and when the device is used for the heating of the steam-boiler the steam is supplied directly from said boiler, and its pressure if in excess of that required will force the valve 34 to closed position, cutting' oft' both the oil and the steam chambers from the discharge-nozzle. When the boiler-pressure is low, the spring' 36 forces the valve open to an extent proportioned to the pressure, and steam then flows through the ports 41 and the annular passage between the valve and the forward end of the block 27, where it meets a volume of oil in the annular recess of the nozzle and carries a thin film of oil down through the opening 44 and into contact with the deilector-plate 48, the latter serving to slightly change the character of the issuing' jet and produce a flat ame.

It is not desirable that the llame should be wholly extinguished even where the boilerpressure is in excess of that required, and in order to provide a pilot-light the periphery of the valve 32 is provided with a groove 50, extending from one of the ports 4l to the ends of the valve. This groove is comparatively small; but it keeps the valve from closing to an extent sufiicient to entirely shut oil' the supply of fluid, and a small quantity of steam and oil will escape from the nozzle in readiness to ignite the larger stream when the valve opens.

Having thus described the invention, what is claimed is4 1. A two-fluid burner having' at one end a hollow head provided with a tapering burnerorifice, a conical partition dividing the head into steam and oil chambers, said partition having' a tapered opening, the wall of which is in alinement with that ofthe orifice, a hollow tapering valve extending through the opening and orilice and provided with passages through which steam may pass to the steam-chamber, concentric steam and oil tubes connected to the head, a spring of iixed resistance tending to maintain the valve in open position, and an adjustable spring tending to close the valve.

2. .In a two-fluid burner, a pair of tubes disposed one within the other and arranged one for the passage of steam and the other for the passage of oil, a cylinder arranged near the discharge end of the inner tube, a pistonvalve disposed in said cylinder and provided with openings for the passage of the steam, a discharge-nozzle arranged at the end of the burner and having an opening for the passage of the fluids, the end of the valve extending into said opening and both opening and valve being' tapered.

3. rl`he combination in a burner, of a ported block having a pair of coneentrically-disposed threaded `flanges, one of which also forms a cylinder, a pair of concentric tubes having threaded ends engaging said threaded flanges, a nozzle member secured to the block and having a tapered discharge-orifice, said nozzle member being further provided with an annular chamber in communication with the ports of the block, a hollow piston arranged in the cylinder', a valve carried by the piston and adapted to close the burnerorilice, a spring arranged within the cylinder and tending to resist movement of the piston under pressure, a second spring exerting' its force in opposition to the first spring, a stuiiingbox arranged at the outer' end of the outer tube, for the passage of the burner-tube, and a threaded stem arranged within the inner tube and serving as a means for adjusting' the stress ofsaid second spring.

In testimony that I claim the foregoing' as my own I have hereto aflixed my signature in the presence of two witnesses.

EMIL CHRISTENSEN.

Vitnesses:

J. E. BoYNTox, FRANK PFLUGER.

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